pitrou commented on a change in pull request #11916:
URL: https://github.com/apache/arrow/pull/11916#discussion_r768133275



##########
File path: ci/docker/conda-cpp.dockerfile
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@@ -54,6 +56,7 @@ ENV ARROW_BUILD_TESTS=ON \
     ARROW_WITH_SNAPPY=ON \
     ARROW_WITH_ZLIB=ON \
     ARROW_WITH_ZSTD=ON \
+    CMAKE_CXX_STANDARD=17 \

Review comment:
       Hmm. I'm not sure I understand the situation entirely, but for now Arrow 
C++ needs to compile on gcc 4.9 (and perhaps even gcc 4.8, for a subset of 
Arrow). This is because of the compiler requirements for R packages...
   
   




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